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REDUCE EQUIPMENT/PIPING METALLURGY FROM SS304 TO MS/CS BY NITROGEN BLANKETING IN THE BIOMASS GASIFICATION GAS CLEANUP AREA

Publishing Venue

The IP.com Prior Art Database

Abstract

The instant disclosure proposes to block the gasifier outlet line and engine inlet valve and pass nitrogen through the gas path and vent it through the flare burner. This may eliminate any chances of gas getting trapped in the line, and therefore may remove any opportunity for condensation after the shutdown. Use of nitrogen may prevent oxygen from entering the gas path, which is required to ensure no gas combustion.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
52% of the total text.

REDUCE EQUIPMENT/PIPING METALLURGY
FROM SS304 TO MS/CS BY NITROGEN BLANKETING IN THE BIOMASS GASIFICATION GAS
CLEANUP AREA

Current biomass
gasification process requires higher metallurgy post the gasifier outlet line than
Stainley Steel 304. This need is due to
the possibility of condensation of gas in the piping when the plant is shut
down and gas may be bottled up in the section.
The reason for this bottle up after shutdown sequence is to ensure no
gas leaks out and no oxygen enters the gas line. Combustion can occur if oxygen enters in the
gas line at a higher temperature.

The instant invention
proposes to block the gasifier outlet line and engine inlet valve by
introducing a nitrogen sweep system using the following process (see Figure 1). As soon as the gasifier is sealed during the
shutdown and all pumps and scrubbers are closed, ensure closing of the
butterfly valve (TSO) at gasifier outlet flange. During the shutdown sequence, the engine
inlet gas valve is closed and flare line is opened. Nitrogen can be pumped in by one of the drain
valves through gas bottles, and pressure should be checked often to ensure it
does not go above about 250 mmWC. At this point, the system can be flushed with
nitrogen while the gas is exiting through the flare line. During this process, the CO content should be
measured at the burner platform. As soon
as CO content dips below 10 ppm, the flare burner valve should be closed and
the nitrogen discontinued. The gas line should then be checked for
condensation.

This process may ensure
the following: No condensable gas present in the line post
nitrogen sweep. No corrosion after the plant is shut down in
the gas clean-up section. Re...